Chemical Decontamination of Process Units

SENTRO Vapor-Phase Chemical Decontamination


  • Chemical injected into steam.
  • Minimal changes in operational steam-out procedures.
  • Continuous injection of fresh chemicals.
  • Continuous monitoring of hydrocarbon / LEL / H2S / Benzene levels.
  • De-oiling, degassing & Sulfide oxidation (no Pyrophorics).
  • Applicable for Heavy Oil Units such as Atmospheric, Vacuum, Visbreaker, Desalter, etc.
  • Applicable for a combination of furnace + tower bottom + overhead system (coolers, accumulator) + pump around / sidecuts, etc.


  • Minimizes Down Time
    • Reduces Steam Out Duration.
    • Reduces Maintenance Activity Before and After Decontamination Process.
  • Environmentally Friendly
    • Biodegradable.
    • Extremely Low Chemical Oxygen Demand (COD) Waste.
    • Does not make Stable Emulsions.
    • Minimizes the amount of waste generated.
  • Effective
    • Penetration and softening of heavy residuals and asphaltenes.
    • Assures chemical contact and reduces the possibility of channeling.
    • Will suspend Coke scale and particulates.
  • Efficient
    • Results are equal to a cascade or full circulation but with less effluent volume.
    • Fewer mechanical connections and less maintenance time.

Set-up is simple, fast, and economical:

  • Includes barrels, barrel pumps, ½” flexible hoses, and ¾” or 1” injection connections.
  • (unlike liquid circulation –this application does not involve a tank, chemical blending, centrifugal pumps, heavy flexible hoses, temporary connections, large effluent volume to be treated, and more..)

SENTRO Liquid-Phase Chemical Decontamination


  • The process is safe and effective
  • Removes heavy oil deposits, organic scale, coke, and polymers
  • Non-hazardous and non-corrosive chemicals, in water-based chemical solution
  • Compatible with the unit’s metallurgy  
  • Effluent is biodegradable and non-transport-regulated
  • Inline 10 um filtration to capture solid particles
  • Chemical solution can be heated by steam or by an external heat source
  • Optional low-temperature circulation for limited-temperature applications
  • Optional for a solvent-base non-aqueous chemical cleaning in specific applications   
  • Optional two-way circulation: direction of the circulation can either be against the process flow or with the process flow


  • Environmentally Friendly
    • Biodegradable
    • Low Chemical Oxygen Demand (COD) Waste
    • Does not make Stable Emulsions
  • Effective
    • Penetration and softening of heavy residuals and asphaltenes
    • Assures chemical contact and reduces the possibility of channeling
    • Will suspend and remove coke scale and particulates

Optional: Boilout chemical decontamination for vessels

  • The vessel is flooded and filled with chemicals and water
  • Steam or an external heat source is added to heat the solution and agitate sludge or solids
  • Covers all sludge layers and assures chemical contact
  • Immediately reduces odor concerns
  • Great application for storage vessels, overhead receivers and fuel gas KO drums
  • Works well in vessels that have limited Tie-in locations or steam connections
  • Allows fewer temperature restrictions

Pre-flush and Post-flash advantages

  • Pre Flushing
    • Helps reduce surface tension and remove free solids
    • Penetration and softening of Atmospheric Residue
    • Assures chemical contact of solids in packed sections and dead spots
  • Post Flushing
    • Assures chemical saturation and neutralization of pyrophoric in large packed sections
    • Helps to carry out free solids
    • Will rinse out residual chemicals and reduce the odor
    • Oxidized rinse water helps with effluent disposal